#include <iostream>
#include <string>
#include <unistd.h>
#include <pthread.h>

using namespace std;

int tickets = 1000;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;// 锁的初始化
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;// 条件变量的初始化

void *start_routine(void *args)
{
    string name = static_cast<const char*>(args);
    while(true)
    {
        pthread_mutex_lock(&mutex);
        pthread_cond_wait(&cond, &mutex);
        cout << name << " -> " << tickets << endl;
        tickets--;
        pthread_mutex_unlock(&mutex);
    }
}

int main()
{
    // 通过条件变量控制线程的运行
    pthread_t t[5];
    for(int i = 0; i < 5; i++)
    {
        char *name = new char[64];
        snprintf(name, 64, "thread %d", i + 1);
        pthread_create(t + i, nullptr, start_routine, name);
    }

    while(true)
    {
        sleep(1);
        // pthread_cond_signal(&cond);// 一次一个唤醒
        pthread_cond_broadcast(&cond);// 全部唤醒
        cout << "main thread wakeup one thread..." << endl;
    }

    for(int i = 0; i < 5; i++)
    {
        pthread_join(t[i], nullptr);
    }

    return 0;
}